package com.yzd.learnjava.generics;

import com.yzd.learnjava.util.Print;
/*
 * ջ
 */
public class LinkedStack<T> {
	private static class Node<U>{
		U item ;
		Node<U> next;
		Node(){
			item = null; 
			next = null;
		}
		
		Node(U item , Node<U> next){
			this.item = item ;
			this.next = next;
		}
		
		boolean end() {
			return item == null && next == null;
		}
		
	}
	
	private Node<T> top = new Node<T>();
	
	public void push(T item) {
		top = new Node<T>(item, top);
	}
	
	public T pop() {
		T result = top.item;
		if(!top.end()) {
			top = top.next;
		}
		return result;
	}
	
	public static void main(String[] args) {
		LinkedStack<String> lss = new LinkedStack<String>();
		for(String s : "Phasers on stun!".split(" ")) {
			lss.push(s);
		};
		
		String s ;
		while((s = lss.pop()) != null) {
			Print.print(s);
		}
		
	}

}
